For two years, Luz Rojas has demanded answers in the shooting of her son, 42-year-old Anastasio Hernández, who died on May 28, 2010 after Border Patrol agents in San Diego used a stun gun to subdue him.

Now, after a dramatic video was released showing that her son was shot while lying on the ground surrounded by a dozen agents, Rojas is stepping up her efforts.

This week, Rojas travelled to the nation’s capital to demand answers. “We’re going on two years now and we haven’t had any response,” said Rojas, who can’t bear to watch the video herself because it is too painful.